Here are a list of sites I enjoy:
(Let me know if you'd like yours added)
http://www.equine-trader.com
http://www.freehorseads.com
http://www.saskhorse.ca
http://horsetopia.horse-for-sale.org
http://www.northernhorse.com
http://www.allbreedpedigree.com
http://regina.kijiji.ca
http://saskatoon.kijiji.ca
http://www.equine.com
http://www.equinehits.com
http://dreamhorse.com
http://www.greenhawk.ca
http://www.shnpayback.com/Stallions
Arabian Resources:
http://www.wunderbararabians.com
http://www.cahr.ca
http://www.arabianhorses.org
http://www.arabianbreeders.net
http://www.saskarab.com
http://www.region17.com
http://www.arabhorse.com
http://www.wcbreeders.ca/
Trainers & Breeders:
http://www.wunderbararabians.com
http://ch-equestrian.com
http://www.freewebs.com/tallmantraining
http://www.freewebs.com/sprucerowstables
http://daretodreamfarm.ca
http://www.sdph.net
http://www.livingwaterpaintsandquarters.com
Lil Tex's Miniatures and Ponies: http://pminiatures.tripod.com